<form method="post" enctype="multipart/form-data">
    <div class="form_block">
    image file: <input type="file" name="file"/>
    </div>
    <div class="form_block">
    min value: <input type="text" name="min"/>
    </div>
    <div class="form_block">
    max value: <input type="text" name="max"/>
    </div>
    <button type="submit">Upload</button>
</form>